new dc/dc converters...

[John Walliker]

On Thursday, 29 September 2022 at 17:33:01 UTC+1, John Larkin wrote:

On Thu, 29 Sep 2022 11:16:11 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
On Wed, 28 Sep 2022 17:08:58 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Wed, 28 Sep 2022 07:39:04 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
8qm8jh9oaked9p4mh...@4ax.com>:

On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin
jlarkin@highland_atwork_technology.com> wrote in
cpi6jhp2rui2013ud...@4ax.com>:

We finally gave up on the dreadful Hammond boxes and custom labels. We
have our own extrusions, blue anodized, and blast all the artwork with
a Boss laser.

https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0

This gets us better EMI and some conduction cooling too. Top and
bottom both come off, which is handy when we have parts on both sides
of the board.

Makes a bad impression
I would like connectors fixed mechanically to the front panel
as this way any forces are directly passed to the peeseebee.

Think about the forces when the connector is fastened to the panel.

Those are controlled by you during assembly, but you never met Big Joe who can turn anything past breakpoint,..

Leave connector nuts loose?


We use a fair number of U.FL to SMA bulkhead cables, which solves both
problems.
That\'s expensive and labor intensive and wouldn\'t work very well in a
small box with lots of connectors.

http://www.highlandtechnology.com/DSS/T564DS.shtml

http://www.highlandtechnology.com/DSS/J270DS.shtml

We are not seeing connectors broken off of PC boards. They make
Corvettes from epoxy-glass.

We did get one batch of end plates with anodize in the countersunk
holes, in defiance of the notes on the drawing. We\'ll have to touch up
with a countersink to clean them up, a mild nuisance. I wonder if
there is a kind of flathead screw that has groves or teeth on the
bevels to scrape through the anoddize. I\'d google but I don\'t know
what to call that.

Maybe our Boss laser could do it, clean out the anodize on the
countersinks.

You could consider a selective conductive \"alodine\" finish in the connector ground areas
or even finish the whole box that way.

https://en.wikipedia.org/wiki/Chromate_conversion_coating

John

 

[Phil Hobbs]

John Larkin wrote:

On Thu, 29 Sep 2022 11:16:11 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

John Larkin wrote:
On Wed, 28 Sep 2022 17:08:58 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Wed, 28 Sep 2022 07:39:04 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
8qm8jh9oaked9p4mh4jbumqdd0ict06n5j@4ax.com>:

On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin
jlarkin@highland_atwork_technology.com> wrote in
cpi6jhp2rui2013ud74ih85ncn8cjmhkn8@4ax.com>:

We finally gave up on the dreadful Hammond boxes and custom labels. We
have our own extrusions, blue anodized, and blast all the artwork with
a Boss laser.

https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0

This gets us better EMI and some conduction cooling too. Top and
bottom both come off, which is handy when we have parts on both sides
of the board.

Makes a bad impression
I would like connectors fixed mechanically to the front panel
as this way any forces are directly passed to the peeseebee.

Think about the forces when the connector is fastened to the panel.

Those are controlled by you during assembly, but you never met Big Joe who can turn anything past breakpoint,..

Leave connector nuts loose?


We use a fair number of U.FL to SMA bulkhead cables, which solves both
problems.

That\'s expensive and labor intensive and wouldn\'t work very well in a
small box with lots of connectors.

http://www.highlandtechnology.com/DSS/T564DS.shtml

http://www.highlandtechnology.com/DSS/J270DS.shtml

We are not seeing connectors broken off of PC boards. They make
Corvettes from epoxy-glass.

We did get one batch of end plates with anodize in the countersunk
holes, in defiance of the notes on the drawing. We\'ll have to touch up
with a countersink to clean them up, a mild nuisance. I wonder if
there is a kind of flathead screw that has groves or teeth on the
bevels to scrape through the anoddize. I\'d google but I don\'t know
what to call that.

Maybe our Boss laser could do it, clean out the anodize on the
countersinks.

Yeah, we normally have one to three connectors. We really like
U.FLs--they have a nice positive snap action, have gold contacts, cost
20 cents, are the size of a SOT23, work up to 6 GHz or so, and have next
to no capacitance. Other than that, they stink.k

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Phil Hobbs]

John Walliker wrote:

On Thursday, 29 September 2022 at 17:33:01 UTC+1, John Larkin wrote:
On Thu, 29 Sep 2022 11:16:11 -0400, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

John Larkin wrote:
On Wed, 28 Sep 2022 17:08:58 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Wed, 28 Sep 2022 07:39:04 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
8qm8jh9oaked9p4mh...@4ax.com>:

On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin
jlarkin@highland_atwork_technology.com> wrote in
cpi6jhp2rui2013ud...@4ax.com>:

We finally gave up on the dreadful Hammond boxes and custom labels. We
have our own extrusions, blue anodized, and blast all the artwork with
a Boss laser.

https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0

This gets us better EMI and some conduction cooling too. Top and
bottom both come off, which is handy when we have parts on both sides
of the board.

Makes a bad impression
I would like connectors fixed mechanically to the front panel
as this way any forces are directly passed to the peeseebee.

Think about the forces when the connector is fastened to the panel.

Those are controlled by you during assembly, but you never met Big Joe who can turn anything past breakpoint,..

Leave connector nuts loose?


We use a fair number of U.FL to SMA bulkhead cables, which solves both
problems.
That\'s expensive and labor intensive and wouldn\'t work very well in a
small box with lots of connectors.

http://www.highlandtechnology.com/DSS/T564DS.shtml

http://www.highlandtechnology.com/DSS/J270DS.shtml

We are not seeing connectors broken off of PC boards. They make
Corvettes from epoxy-glass.

We did get one batch of end plates with anodize in the countersunk
holes, in defiance of the notes on the drawing. We\'ll have to touch up
with a countersink to clean them up, a mild nuisance. I wonder if
there is a kind of flathead screw that has groves or teeth on the
bevels to scrape through the anoddize. I\'d google but I don\'t know
what to call that.

Maybe our Boss laser could do it, clean out the anodize on the
countersinks.

You could consider a selective conductive \"alodine\" finish in the connector ground areas
or even finish the whole box that way.

https://en.wikipedia.org/wiki/Chromate_conversion_coating

John

The hexavalent chrome stuff is very good, but has just about been
regulated out of existence. The Cr+4 stuff sucks.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Don]

Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:

<snip>

Today was interesting, I killed my Chinese satellite receiver box few days
ago in the storm
likely did draw too much power when I moved the dish against the storm we had.
had replaced the original current limited 12 V wallwart with a more powerful
one.. my fault...
It would still move the dish but always to the wrong angle..
Dish motor on PC sat card OK,, So dish positioner OK.
Bought the thing for about 30$ or so on ebay years ago, 1080 progressive HD,
900 free TV channels, many satellites..
Lots like these now for double that price locally...
Anyways opened it, and could not find any defective parts
Very nice multilayer board, very dense, tuner, several switchmode converters...
no partnumers readable..
Almost gave up.. what could it be? lots of work to enter all my satellites and
stations in a new one..
then I had an idea, nothing to lose... switched from manual angle definitions
to USALS
and low and behold, now I have even more stations
Probably a bit flipped in the firmware, but in USALS it calculates position
from your current (GPS) location each time you select a sat,

And look how nice it is made,:
http://panteltje.com/pub/hd_sat_reciever_front_IXIMG_0862.JPG
http://panteltje.com/pub/hd_sat_receiver_backpanel_IXIMG_0863.JPG
http://panteltje.com/pub/hd_sat_receiver_backpanel_IXIMG_0864.JPG
http://panteltje.com/pub/hd_sat_receiver_inside_IXIMG_0865.JPG
that is a 500 MHz processor under that little heatsink (ball grid array)
The buttons and display are on a separate PCBs conencted with flex cable.
You can open it by removing 2 screws in the back
thin metal housing just slides backward...
nice cinch connectors screwed against the back
LNB input fixed to tuner module that is fixed to the PCB can take a hit

and 30$ !!!!
There is a LOT to learn from this, I had it all apart and was amazed by the PC
B layout

My hat off to the designer of that box.

Value for money .. value for many...
many versions
https://www.ebay.com/itm/354190172519

\"Value for money .. value for many...\" says it all.

Beings the OP\'s \"look at my cobbled together thing\" serves as this
thread\'s theme, here\'s another peek at my own cobbled contraption:
<https://crcomp.net/mp3mod/index.php>

My webpage needs an update because this guy:
<https://www.ebay.com/itm/304571755908> recently replaced the cheap mp3
player. The new board costs only US$3.95 and it runs circles around the
old player. You can read about all of the functionality packed into one
proprietary chip on my new board.
For my purposes - outdoor cycle spins and dog walks - only the 3.5mm
output\'s necessary. Connected to a Sony Walkman MJR-J10, because they
reliably stay in place.
A few sad old dogs whined about corded earbuds and mp3 players the
last time a link to my gizmo was posted. Nonetheless, in the end, my
gadget proves out as the best solution for my needs.

Danke,

--
Don, KB7RPU, https://www.qsl.net/kb7rpu
There was a young lady named Bright Whose speed was far faster than light;
She set out one day In a relative way And returned on the previous night.

 

[John Larkin]

On Thu, 29 Sep 2022 13:07:25 -0400, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

John Larkin wrote:
On Thu, 29 Sep 2022 11:16:11 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

John Larkin wrote:
On Wed, 28 Sep 2022 17:08:58 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Wed, 28 Sep 2022 07:39:04 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
8qm8jh9oaked9p4mh4jbumqdd0ict06n5j@4ax.com>:

On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin
jlarkin@highland_atwork_technology.com> wrote in
cpi6jhp2rui2013ud74ih85ncn8cjmhkn8@4ax.com>:

We finally gave up on the dreadful Hammond boxes and custom labels. We
have our own extrusions, blue anodized, and blast all the artwork with
a Boss laser.

https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0

This gets us better EMI and some conduction cooling too. Top and
bottom both come off, which is handy when we have parts on both sides
of the board.

Makes a bad impression
I would like connectors fixed mechanically to the front panel
as this way any forces are directly passed to the peeseebee.

Think about the forces when the connector is fastened to the panel.

Those are controlled by you during assembly, but you never met Big Joe who can turn anything past breakpoint,..

Leave connector nuts loose?


We use a fair number of U.FL to SMA bulkhead cables, which solves both
problems.

That\'s expensive and labor intensive and wouldn\'t work very well in a
small box with lots of connectors.

http://www.highlandtechnology.com/DSS/T564DS.shtml

http://www.highlandtechnology.com/DSS/J270DS.shtml

We are not seeing connectors broken off of PC boards. They make
Corvettes from epoxy-glass.

We did get one batch of end plates with anodize in the countersunk
holes, in defiance of the notes on the drawing. We\'ll have to touch up
with a countersink to clean them up, a mild nuisance. I wonder if
there is a kind of flathead screw that has groves or teeth on the
bevels to scrape through the anoddize. I\'d google but I don\'t know
what to call that.

Maybe our Boss laser could do it, clean out the anodize on the
countersinks.


Yeah, we normally have one to three connectors. We really like
U.FLs--they have a nice positive snap action, have gold contacts, cost
20 cents, are the size of a SOT23, work up to 6 GHz or so, and have next
to no capacitance. Other than that, they stink.k

Cheers

Phil Hobbs

They are hard to mate and un-mate.

Transmission-line transformer, stock cable assembly:

https://www.dropbox.com/s/5o6mf5x94n1e08a/Z412_X.JPG?raw=1

https://www.dropbox.com/s/kc217v0lfqaa48u/Pot_Core_TXline.JPG?raw=1

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

 

[Clifford Heath]

On 29/9/22 11:55, Anthony William Sloman wrote:

On Thursday, September 29, 2022 at 8:05:37 AM UTC+10, John Larkin wrote:
On Thu, 29 Sep 2022 07:00:50 +1000, Clifford Heath <no_...@please.net> wrote:
On 29/9/22 02:19, Don wrote:

On the other hand, companies who manufacture consumer products must put
more thought into design language: <https://paia.com/

That\'s not just consumer - it\'s music production. Those folk are true
aesthetes. Musicians believe that beautiful instruments enable them to
make more beautiful music, and I think they\'re right.

It\'s a fact that beautiful schematics and pcb\'s work better than ugly ones.

But beauty is in the eye of the beholder.

Some people don\'t think about what they are seeing, and aesthetic appreciation isn\'t a rational process. If a schematic or a pcb just looks like one that worked well in the past, you are going to like it better than one that looks like something that didn\'t. As \"facts\" go, this has to be one of the less useful ones.

Beauty might be in the eye of the beholder, but if you lack any
aesthetic sense, ugliness is a knife in your back.

 

[John Larkin]

On Fri, 30 Sep 2022 08:26:55 +1000, Clifford Heath
<no_spam@please.net> wrote:

On 29/9/22 11:55, Anthony William Sloman wrote:
On Thursday, September 29, 2022 at 8:05:37 AM UTC+10, John Larkin wrote:
On Thu, 29 Sep 2022 07:00:50 +1000, Clifford Heath <no_...@please.net> wrote:
On 29/9/22 02:19, Don wrote:

On the other hand, companies who manufacture consumer products must put
more thought into design language: <https://paia.com/

That\'s not just consumer - it\'s music production. Those folk are true
aesthetes. Musicians believe that beautiful instruments enable them to
make more beautiful music, and I think they\'re right.

It\'s a fact that beautiful schematics and pcb\'s work better than ugly ones.

But beauty is in the eye of the beholder.

Some people don\'t think about what they are seeing, and aesthetic appreciation isn\'t a rational process. If a schematic or a pcb just looks like one that worked well in the past, you are going to like it better than one that looks like something that didn\'t. As \"facts\" go, this has to be one of the less useful ones.


Beauty might be in the eye of the beholder, but if you lack any
aesthetic sense, ugliness is a knife in your back.

Beautiful schematics and boards work better for a couple of reasons.
One, they have had more time being beautified and looked at and
thought about. Two, they are designed by people who really care about
details.

 

[Anthony William Sloman]

On Friday, September 30, 2022 at 8:47:13 AM UTC+10, John Larkin wrote:

On Fri, 30 Sep 2022 08:26:55 +1000, Clifford Heath <no_...@please.net> wrote:
On 29/9/22 11:55, Anthony William Sloman wrote:
On Thursday, September 29, 2022 at 8:05:37 AM UTC+10, John Larkin wrote:
On Thu, 29 Sep 2022 07:00:50 +1000, Clifford Heath <no_...@please.net> wrote:
On 29/9/22 02:19, Don wrote:

On the other hand, companies who manufacture consumer products must put
more thought into design language: <https://paia.com/

That\'s not just consumer - it\'s music production. Those folk are true
aesthetes. Musicians believe that beautiful instruments enable them to
make more beautiful music, and I think they\'re right.

It\'s a fact that beautiful schematics and pcb\'s work better than ugly ones.

But beauty is in the eye of the beholder.

Some people don\'t think about what they are seeing, and aesthetic appreciation isn\'t a rational process. If a schematic or a pcb just looks like one that worked well in the past, you are going to like it better than one that looks like something that didn\'t. As \"facts\" go, this has to be one of the less useful ones.

Beauty might be in the eye of the beholder, but if you lack any
aesthetic sense, ugliness is a knife in your back.

Beautiful schematics and boards work better for a couple of reasons.
One, they have had more time being beautified and looked at and
thought about.

This helps if the person who did the beautification knew what they were doing. Bringing the board proportions closer to the gold mean won\'t make the circuit work any better

> Two, they are designed by people who really care about details.

Caring about details isn\'t getting the fundamentals right. John Larkin doesn\'t care about design details enough to have any enthusiasm for designing his own special purpose transformers to have exactly the right performance for a particular circuit. Caring about the proportions of the printed circuit board is a less profitable use of his time.

--
Bill Sloman, Sydney

 

[Jan Panteltje]

On a sunny day (Thu, 29 Sep 2022 18:08:14 -0000 (UTC)) it happened \"Don\"
<g@crcomp.net> wrote in <20220929a@crcomp.net>:

Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:
https://www.ebay.com/itm/354190172519

\"Value for money .. value for many...\" says it all.

Beings the OP\'s \"look at my cobbled together thing\" serves as this
thread\'s theme, here\'s another peek at my own cobbled contraption:
https://crcomp.net/mp3mod/index.php

Ha! I have several of those !
Bought many years ago from ebay...
My mp3 player however is a Creative Muvo, 10 hours on an eneloop AAA

My webpage needs an update because this guy:
https://www.ebay.com/itm/304571755908> recently replaced the cheap mp3
player.

That one is new to me...
My creative muvo has been working now for almost 13 years...?
http://panteltje.com/pub/muvo_1_img_1638.jpg
http://panteltje.com/pub/muvo_2_img_1639.jpg
http://panteltje.com/pub/muvo_3_img_1640.jpg
No idea what I payed for it, bought locally in a store, love at first sight.

Also have a credit card size mp3 / video player from ebay
and little credit card size FM radios
Some came 3 for a few dollars... Al works.

The new board costs only US$3.95 and it runs circles around the
old player. You can read about all of the functionality packed into one
proprietary chip on my new board.
For my purposes - outdoor cycle spins and dog walks - only the 3.5mm
output\'s necessary. Connected to a Sony Walkman MJR-J10, because they
reliably stay in place.
A few sad old dogs whined about corded earbuds and mp3 players the
last time a link to my gizmo was posted. Nonetheless, in the end, my
gadget proves out as the best solution for my needs.

Danke,

--
Don, KB7RPU, https://www.qsl.net/kb7rpu

Interesting links
My wall clock:
http://panteltje.com/panteltje/raspberry_pi_FDS132_matrix_display_driver/index.html

 

[Phil Hobbs]

John Larkin wrote:

On Thu, 29 Sep 2022 13:07:25 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

John Larkin wrote:
On Thu, 29 Sep 2022 11:16:11 -0400, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

John Larkin wrote:
On Wed, 28 Sep 2022 17:08:58 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Wed, 28 Sep 2022 07:39:04 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
8qm8jh9oaked9p4mh4jbumqdd0ict06n5j@4ax.com>:

On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin
jlarkin@highland_atwork_technology.com> wrote in
cpi6jhp2rui2013ud74ih85ncn8cjmhkn8@4ax.com>:

We finally gave up on the dreadful Hammond boxes and custom labels. We
have our own extrusions, blue anodized, and blast all the artwork with
a Boss laser.

https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0

This gets us better EMI and some conduction cooling too. Top and
bottom both come off, which is handy when we have parts on both sides
of the board.

Makes a bad impression
I would like connectors fixed mechanically to the front panel
as this way any forces are directly passed to the peeseebee.

Think about the forces when the connector is fastened to the panel.

Those are controlled by you during assembly, but you never met Big Joe who can turn anything past breakpoint,..

Leave connector nuts loose?


We use a fair number of U.FL to SMA bulkhead cables, which solves both
problems.

That\'s expensive and labor intensive and wouldn\'t work very well in a
small box with lots of connectors.

http://www.highlandtechnology.com/DSS/T564DS.shtml

http://www.highlandtechnology.com/DSS/J270DS.shtml

We are not seeing connectors broken off of PC boards. They make
Corvettes from epoxy-glass.

We did get one batch of end plates with anodize in the countersunk
holes, in defiance of the notes on the drawing. We\'ll have to touch up
with a countersink to clean them up, a mild nuisance. I wonder if
there is a kind of flathead screw that has groves or teeth on the
bevels to scrape through the anoddize. I\'d google but I don\'t know
what to call that.

Maybe our Boss laser could do it, clean out the anodize on the
countersinks.


Yeah, we normally have one to three connectors. We really like
U.FLs--they have a nice positive snap action, have gold contacts, cost
20 cents, are the size of a SOT23, work up to 6 GHz or so, and have next
to no capacitance. Other than that, they stink.


They are hard to mate and un-mate.

Mating is easy. Unmating needs a quarter-twist of a small screwdriver
under the panhandle (where the cable attaches).

One of their principal virtues is that you can sprinkle them as test
points, which gets rid of the usual scope probe problems with pickup and
ground inductance. They don\'t have to be populated in the production
boards, and the footprints are small enough to ignore (usually).

Transmission-line transformer, stock cable assembly:

https://www.dropbox.com/s/5o6mf5x94n1e08a/Z412_X.JPG?raw=1

https://www.dropbox.com/s/kc217v0lfqaa48u/Pot_Core_TXline.JPG?raw=1

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

Yeah, that\'s a cute hack I\'ve been meaning tor try out.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Jan Panteltje]

>> https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

 

[John Larkin]

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

https://www.dropbox.com/s/oam60ys8n0pt8bo/T750_1.JPG?raw=1

https://www.dropbox.com/s/afe4oa9xuqdpbi2/Xfmrs.JPG?raw=1

We can buy those \"windings\" from Digikey. Elegant.

But tx transformers make gorgeous isolated outputs

https://www.dropbox.com/s/lkjr6ktog40zn3p/T760_Out_Pulse.jpg?raw=1

That was driven by mosfets. We\'ll go GaN in the future and get more
speed and more voltage.

 

[Anthony William Sloman]

On Saturday, October 1, 2022 at 12:41:37 AM UTC+10, John Larkin wrote:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

You don\'t have to strip semi-rigid coax, and there are crimp connectors for it, Of course it is more expensive than regular coax, but it is a lot more uniform.

But tx transformers make gorgeous isolated outputs

https://www.dropbox.com/s/lkjr6ktog40zn3p/T760_Out_Pulse.jpg?raw=1

The waveform looks a bit grassy. Semi-rigid coax might run a lawn-mower over it, if you did it right. Our narrowest pulse was half a nanosecond wide, back in the 1980\'s and only a few volts high .

--
Bill Sloman, Sydney

 

[Jan Panteltje]

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<ihvdjh50jhq407o7ti2b3csitdoo7ntc8k@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

https://www.dropbox.com/s/oam60ys8n0pt8bo/T750_1.JPG?raw=1

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors
I have some equipment with these models but did not feel reliable.
Have some problem here with an USB RTL-SDR stick also the RF connector
should solder it really.

 

[John Larkin]

On Fri, 30 Sep 2022 16:42:49 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
ihvdjh50jhq407o7ti2b3csitdoo7ntc8k@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

https://www.dropbox.com/s/oam60ys8n0pt8bo/T750_1.JPG?raw=1

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors

Works great. Electronics needs connectors.

Cutting, stripping, soldering micro-coax is not easy or reliable.

 

[Jan Panteltje]

On a sunny day (Fri, 30 Sep 2022 10:26:15 -0700) it happened John Larkin
<jlarkin@highlandSNIPMEtechnology.com> wrote in
<rh9ejh17a3o1t61a4hpbqgnbk8df8g1iuq@4ax.com>:

On Fri, 30 Sep 2022 16:42:49 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
ihvdjh50jhq407o7ti2b3csitdoo7ntc8k@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

https://www.dropbox.com/s/oam60ys8n0pt8bo/T750_1.JPG?raw=1

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors

Works great. Electronics needs connectors.

>Cutting, stripping, soldering micro-coax is not easy or reliable.

Well I never had a problem with RG178
putting on connectors in the right way requires more effort.
Do you do this just for the looks of it?? ;-)

 

[Phil Hobbs]

Jan Panteltje wrote:

On a sunny day (Fri, 30 Sep 2022 10:26:15 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
rh9ejh17a3o1t61a4hpbqgnbk8df8g1iuq@4ax.com>:

On Fri, 30 Sep 2022 16:42:49 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
ihvdjh50jhq407o7ti2b3csitdoo7ntc8k@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

https://www.dropbox.com/s/oam60ys8n0pt8bo/T750_1.JPG?raw=1

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors

Works great. Electronics needs connectors.


Cutting, stripping, soldering micro-coax is not easy or reliable.

Well I never had a problem with RG178
putting on connectors in the right way requires more effort.
Do you do this just for the looks of it?? ;-)

U.FL jumpers are very cheap and work very well. We use quite a few.

I wouldn\'t want to try making one by hand!

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[whit3rd]

On Friday, September 30, 2022 at 10:26:23 AM UTC-7, John Larkin wrote:

On Fri, 30 Sep 2022 16:42:49 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
ihvdjh50jhq407o7t...@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors
Works great. Electronics needs connectors.

Cutting, stripping, soldering micro-coax is not easy or reliable.

Didn\'t you say you were buying prebuilt connectorized cables? Crimping
is also not easy, but with the right (expensive) equipment, it\'s reliable.

Coaxial cable doesn\'t reflow-solder nicely, even if you wanted to hand-solder,
a bit of a preformed collar or wrap for the braid would be prudent. I like
to whip ends with a copper strand, like it was a rope, then tin that.
Works on stainless steel brake cables for the bike, too, with silver solder.

 

[Jan Panteltje]

On a sunny day (Sat, 1 Oct 2022 02:04:44 -0700 (PDT)) it happened whit3rd
<whit3rd@gmail.com> wrote in
<07981aaf-05aa-4fd9-9b28-7036fbd2a8b7n@googlegroups.com>:

On Friday, September 30, 2022 at 10:26:23 AM UTC-7, John Larkin wrote:
On Fri, 30 Sep 2022 16:42:49 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
jla...@highlandSNIPMEtechnology.com> wrote in
ihvdjh50jhq407o7t...@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonSt...@yahoo.com> wrote:

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors
Works great. Electronics needs connectors.

Cutting, stripping, soldering micro-coax is not easy or reliable.

Didn\'t you say you were buying prebuilt connectorized cables? Crimping
is also not easy, but with the right (expensive) equipment, it\'s reliable.

Yes I have a lot of those with SMA connectors to connect things,
but only one length, that length would have to be correct for his coils.
He could have them made to length in China for large quantities perhaps.

>Coaxial cable doesn\'t reflow-solder nicely, even if you wanted to hand-solder,

Sometimes higher temperature helps 370 degrees C should work.

a bit of a preformed collar or wrap for the braid would be prudent. I like
to whip ends with a copper strand, like it was a rope, then tin that.
Works on stainless steel brake cables for the bike, too, with silver solder.

Nice, have not tried that.
Here an example with RG178:
http://panteltje.com/pub/soldering_RG178_IXIMG_0871.JPG
I use that coax for about everything RF, that one makes a tuned antenna from a piece of 300 twin wire, impedance matched.
https://m0ukd.com/calculators/slim-jim-and-j-pole-calculator/

But even my sat dish with rotor uses that cable, it is so thin you do not have to drill holes in the outside wall
just goes through the window. that you can then close without problems...
PTFE, bit harder to melt the insulation, melting point 327 degrees C, makes soldering easier.

 

[John Larkin]

On Sat, 01 Oct 2022 06:23:52 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 10:26:15 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
rh9ejh17a3o1t61a4hpbqgnbk8df8g1iuq@4ax.com>:

On Fri, 30 Sep 2022 16:42:49 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

On a sunny day (Fri, 30 Sep 2022 07:41:26 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
ihvdjh50jhq407o7ti2b3csitdoo7ntc8k@4ax.com>:

On Fri, 30 Sep 2022 13:51:37 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

https://www.dropbox.com/s/zpu6wpli7pvwuih/TX_1.jpg?raw=1

What\'s wrong with just a drop of solder?
Or are you changing potcores all the time?

Stripping and soldering coax is a lot of labor.

https://www.dropbox.com/s/oam60ys8n0pt8bo/T750_1.JPG?raw=1

Yes, is that not more reliable? I mean
connectors.. seen many problems with connectors

Works great. Electronics needs connectors.


Cutting, stripping, soldering micro-coax is not easy or reliable.

Well I never had a problem with RG178
putting on connectors in the right way requires more effort.
Do you do this just for the looks of it?? ;-)

We just buy that cable assembly for $1.54. And pick-and-place the
connectors on the board. It\'s a cheap and easy and reliable.

But it does look cool, got to admit.

Given the need to make a custom transmission-line transformer, this is
a great way to do it. This is the isolated high-voltage output option
of a pulse/delay generator.